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[CMake] Check -ffreestanding as C not C++ flag

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When -ffreestanding is used, main() isn't considered special and
when compiled as C++ code it'll get mangled which makes the
compilation fail since main() will be undefined so this check will
never succeed.

Differential Revision: https://reviews.llvm.org/D49332

llvm-svn: 345632
This commit is contained in:
Petr Hosek 2018-10-30 19:19:47 +00:00
parent 3e89fa8e08
commit 0bd1a0fac1
1 changed files with 1 additions and 1 deletions
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2
compiler-rt/cmake/config-ix.cmake
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@ -53,6 +53,7 @@ if (COMPILER_RT_HAS_NODEFAULTLIBS_FLAG)
endif ()
# CodeGen options.
check_c_compiler_flag(-ffreestanding COMPILER_RT_HAS_FFREESTANDING_FLAG)
check_cxx_compiler_flag(-fPIC COMPILER_RT_HAS_FPIC_FLAG)
check_cxx_compiler_flag(-fPIE COMPILER_RT_HAS_FPIE_FLAG)
check_cxx_compiler_flag(-fno-builtin COMPILER_RT_HAS_FNO_BUILTIN_FLAG)
@ -64,7 +65,6 @@ check_cxx_compiler_flag(-fno-sanitize=safe-stack COMPILER_RT_HAS_FNO_SANITIZE_SA
check_cxx_compiler_flag(-fvisibility=hidden COMPILER_RT_HAS_FVISIBILITY_HIDDEN_FLAG)
check_cxx_compiler_flag(-frtti COMPILER_RT_HAS_FRTTI_FLAG)
check_cxx_compiler_flag(-fno-rtti COMPILER_RT_HAS_FNO_RTTI_FLAG)
check_cxx_compiler_flag(-ffreestanding COMPILER_RT_HAS_FFREESTANDING_FLAG)
check_cxx_compiler_flag("-Werror -fno-function-sections" COMPILER_RT_HAS_FNO_FUNCTION_SECTIONS_FLAG)
check_cxx_compiler_flag(-std=c++11 COMPILER_RT_HAS_STD_CXX11_FLAG)
check_cxx_compiler_flag(-ftls-model=initial-exec COMPILER_RT_HAS_FTLS_MODEL_INITIAL_EXEC)